“The Devil” is a story about two men who were predestined to confront each other over a tragic incident that happened when they were young, and a woman who has psychometric powers. Through the bitter fight of its main characters and their desperate attempts to uncover the truth, this drama attempts to find answers to such questions as what is good and what is evil, and how good and bad fortune are formed. The murder case that begins with an afterimage of one girl is completely ignored and closed quickly because of the girl’s preposterous testimony. Twelve years later, detective Kang Oh-soo (played by Um Tae-woong) receives a taro card meaning “judgment” and a letter. A brutal game begins between the culprit and the victim of the case, which began as a trivial incident 12 years ago but has snowballed into a big tragedy, and a mysterious witness.